Gryphonne IV is a Dead World that was once an Imperial Forge World located in the Shiola Sub-sector of the Segmentum Tempestus' Alduin Sector. Gryphonne IV was the homeworld of the Titan Legio Gryphonicus and some of the fiercest and most skilled Skitarii Legions in the galaxy. Gryphonne IV was known to be one of the most well-defended worlds in the Segmentum Tempestus, which made its destruction all the more shocking. Gryphonne IV was one of the few Adeptus Mechanicus Forge Worlds that produced in significant quantities the less common Leman Russ main battle tank variant known as the Conqueror for the Imperial Guard. The designs for this Leman Russ variant were originally discovered on Gryphonne V. Following the loss of the Forge World of Tigrus, Gryphonne IV was also (with Stygies VIII)